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Mackenzie Clark

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This graph shows an example of how Fitbit tracks heart rate throughout your exercise. Represented is health reporter Mackenzie Clark’s elliptical workout on Oct. 26, 2017, from warmup to cooldown.

Health reporter Mackenzie Clark's Fitbit Ionic is shown on Oct. 28, 2017.

This map demonstrates Fitbit Ionic's built-in GPS capabilities. Health reporter Mackenzie Clark took a quick walk around the block of Seventh and Massachusetts and Vermont streets Saturday, Oct. 28 to try it out.

This graph shows health reporter Mackenzie Clark's strength training session from Saturday, Oct. 28, 2017. As shown in the random peaks and valleys in some of this heart rate data, Fitbit has trouble keeping steady data when workouts involve a lot of arm movement.

This graph shows an example of how Fitbit tracks your movements and heart rate to determine how much time you spend in each stage of sleep overnight. Shown here is health reporter Mackenzie Clark's data from Friday, Oct. 27, 2017.

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